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To argue for a cause-and-effect relationship, scientists must attempt to explain why and how a connection could occur.

想要证明因果关系，科学家们必须尽量解释这种联系可能出现的原因和方式。

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So, if you absolutely must attempt to rectify a chart, here are a few tips to go about doing it.

因此，如果你确定要进行生时矫正，以下是一些你需要做的事情。

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At sixty degrees below zero, a man with wet feet must not fail in his first attempt to build a fire.

VOA: special.2010.05.01

The setback now means Australia must attempt to square the series without their figurehead and best batsman of the last decade.

BBC: Ashes: Aussie captain Ricky Ponting out of Sydney Test

Instead we must attempt to impose peace by a balance of forces.

UNESCO: MEDIA SERVICES

In the classroom next door, 21-year-old Dechen Dema gulps hard as her tutor, Dawa Tshering, presents the artwork she must attempt to replicate.

BBC: Bhutan, the kingdom of the clouds